Single sign on is very desirable in heterogeneous environments. In an ideal world an organisation would have a central database of user accounts that would be used by Windows, Unix, Linux and other systems. This would mean that a person would have the same identity on every platform and system.
At Erion we have experience of many different technologies behind modern single sign on environments. These include, LDAP, Kerberos, Active Directory, Samba, Winbind, NSS, PAM, VAS, SFU and PADL. We can help you choose an implement the best solution for your needs.